/**
 * Copyright 2010-present Facebook.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.facebook;

import android.os.Handler;

class RequestProgress
{
  private final Request request;
  private final Handler callbackHandler;
  private final long threshold;

  private long progress, lastReportedProgress, maxProgress;

  RequestProgress(Handler callbackHandler, Request request)
  {
    this.request = request;
    this.callbackHandler = callbackHandler;

    this.threshold = Settings.getOnProgressThreshold();
  }

  long getProgress()
  {
    return progress;
  }

  long getMaxProgress()
  {
    return maxProgress;
  }

  void addProgress(long size)
  {
    progress += size;

    if (progress >= lastReportedProgress + threshold || progress >= maxProgress)
    {
      reportProgress();
    }
  }

  void addToMax(long size)
  {
    maxProgress += size;
  }

  void reportProgress()
  {
    if (progress > lastReportedProgress)
    {
      Request.Callback callback = request.getCallback();
      if (maxProgress > 0 && callback instanceof Request.OnProgressCallback)
      {
        // Keep copies to avoid threading issues
        final long currentCopy = progress;
        final long maxProgressCopy = maxProgress;
        final Request.OnProgressCallback callbackCopy = (Request.OnProgressCallback) callback;
        if (callbackHandler == null)
        {
          callbackCopy.onProgress(currentCopy, maxProgressCopy);
        }
        else
        {
          callbackHandler.post(new Runnable()
          {
            @Override
            public void run()
            {
              callbackCopy.onProgress(currentCopy, maxProgressCopy);
            }
          });
        }
        lastReportedProgress = progress;
      }
    }
  }
}
